foo.c: In function 'main':
foo.c:16:10: error: expected ',' or ';' before 'long'
   16 |          long long answer=a%d;
      |          ^~~~
foo.c:17:25: error: 'answer' undeclared (first use in this function)
   17 |          printf("%lld ",answer);
      |                         ^~~~~~
foo.c:17:25: note: each undeclared identifier is reported only once for each function it appears in
foo.c:15:26: warning: unused variable 'd' [-Wunused-variable]
   15 |          const long long d=1000007
      |                          ^

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